Need suggestion: I have a Bushmaster AR15. I have purchased the EOTech 557.223 and a Promag PM136 fixed site. The Promag PM136 sits too low so I thought I could buy a Mini Rail from Yankee Hill, YHM-226 to be exact, to raise the PM136. Have received the YHM-226, it looked perfect, except it would not slide onto the rail. I am told by the manufacturer that my rail must be different.

Short of grinding on the YHM-226 to make it fit, I need a rail riser to raise the PM136, just like the YHM-226, can anyone suggest anything.